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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
function Formatter(codeMirror, builder)
{
console.assert(codeMirror);
console.assert(builder);
this._codeMirror = codeMirror;
this._builder = builder;
this._lastToken = null;
this._lastContent = "";
};
Formatter.prototype = {
constructor: Formatter,
// Public
format: function(from, to)
{
console.assert(this._builder.originalContent === null);
if (this._builder.originalContent !== null)
return;
var outerMode = this._codeMirror.getMode();
var content = this._codeMirror.getRange(from, to);
var state = CodeMirror.copyState(outerMode, this._codeMirror.getTokenAt(from).state);
this._builder.setOriginalContent(content);
var lineOffset = 0;
var lines = content.split("\n");
for (var i = 0; i < lines.length; ++i) {
var line = lines[i];
var startOfNewLine = true;
var firstTokenOnLine = true;
var stream = new CodeMirror.StringStream(line);
while (!stream.eol()) {
var innerMode = CodeMirror.innerMode(outerMode, state);
var token = outerMode.token(stream, state);
var isWhiteSpace = token === null && /^\s*$/.test(stream.current());
this._handleToken(innerMode.mode, token, state, stream, lineOffset + stream.start, isWhiteSpace, startOfNewLine, firstTokenOnLine);
stream.start = stream.pos;
startOfNewLine = false;
if (firstTokenOnLine && !isWhiteSpace)
firstTokenOnLine = false;
}
if (firstTokenOnLine)
this._handleEmptyLine();
lineOffset += line.length + 1; // +1 for the "\n" removed in split.
this._handleLineEnding(lineOffset - 1); // -1 for the index of the "\n".
}
this._builder.finish();
},
// Private
_handleToken: function(mode, token, state, stream, originalPosition, isWhiteSpace, startOfNewLine, firstTokenOnLine)
{
// String content of the token.
var content = stream.current();
// Start of a new line. Insert a newline to be safe if code was not-ASI safe. These are collapsed.
if (startOfNewLine)
this._builder.appendNewline();
// Whitespace. Collapse to a single space.
if (isWhiteSpace) {
this._builder.appendSpace();
return;
}
// Avoid some hooks for content in comments.
var isComment = token && /\bcomment\b/.test(token);
if (mode.modifyStateForTokenPre)
mode.modifyStateForTokenPre(this._lastToken, this._lastContent, token, state, content, isComment);
// Should we remove the last newline?
if (this._builder.lastTokenWasNewline && mode.removeLastNewline(this._lastToken, this._lastContent, token, state, content, isComment, firstTokenOnLine))
this._builder.removeLastNewline();
// Add whitespace after the last token?
if (!this._builder.lastTokenWasWhitespace && mode.shouldHaveSpaceAfterLastToken(this._lastToken, this._lastContent, token, state, content, isComment))
this._builder.appendSpace();
// Add whitespace before this token?
if (!this._builder.lastTokenWasWhitespace && mode.shouldHaveSpaceBeforeToken(this._lastToken, this._lastContent, token, state, content, isComment))
this._builder.appendSpace();
// Should we dedent before this token?
var dedents = mode.dedentsBeforeToken(this._lastToken, this._lastContent, token, state, content, isComment);
while (dedents-- > 0)
this._builder.dedent();
// Should we add a newline before this token?
if (mode.newlineBeforeToken(this._lastToken, this._lastContent, token, state, content, isComment))
this._builder.appendNewline();
// Should we indent before this token?
if (mode.indentBeforeToken(this._lastToken, this._lastContent, token, state, content, isComment))
this._builder.indent();
// Append token.
this._builder.appendToken(content, originalPosition);
// Let the pretty printer update any state it keeps track of.
if (mode.modifyStateForTokenPost)
mode.modifyStateForTokenPost(this._lastToken, this._lastContent, token, state, content, isComment);
// Should we indent or dedent after this token?
if (!isComment && mode.indentAfterToken(this._lastToken, this._lastContent, token, state, content, isComment))
this._builder.indent();
// Should we add newlines after this token?
var newlines = mode.newlinesAfterToken(this._lastToken, this._lastContent, token, state, content, isComment);
if (newlines)
this._builder.appendMultipleNewlines(newlines);
// Record this token as the last token.
this._lastToken = token;
this._lastContent = content;
},
_handleEmptyLine: function()
{
// Preserve original whitespace only lines by adding a newline.
// However, don't do this if the builder just added multiple newlines.
if (!(this._builder.lastTokenWasNewline && this._builder.lastNewlineAppendWasMultiple))
this._builder.appendNewline(true);
},
_handleLineEnding: function(originalNewLinePosition)
{
// Record the original line ending.
this._builder.addOriginalLineEnding(originalNewLinePosition);
}
};
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